Mattress bottom support



FIG. 1 is a top view of a mattress bottom support showing my new design;

FIG. 2 is a front view of the mattress bottom support;

FIG. 3 is a left side view of the mattress bottom support;

FIG. 4 is a rear view of the mattress bottom support;

FIG. 5 is a right-side view of the mattress bottom support;

FIG. 6 is a bottom view of the mattress bottom support; and,

FIG. 7 is a perspective view of the mattress bottom support. 

CLAIM I claim the ornamental design for a mattress bottom support, as shown and described. 